Of all the components that make up this Crankcase the Bolt, Flange(4my) has the lowest price.
The Crankcase assembly is constructed from several parts from which the Crankcase Assy is the most expensive.
A sample from the products for the Crankcase include: Bolt, Small Flange, Clamp, Plug, Drain (3r4), Bolt, Flange(4un).